Cloud-based tunnel protocol systems and methods for multiple ports and protocols

ABSTRACT

Systems and methods include establishing a control channel of a tunnel utilizing a first encryption technique, wherein the tunnel is between a local node including one or more processors and a remote node, and wherein the control channel includes a session identifier; establishing a data channel of the tunnel utilizing a second encryption technique, wherein the data tunnel is bound to the control channel based on the session identifier; performing, over the control channel, device authentication and user authentication of one or more users associated with the remote node, wherein each of the one or more users includes a user identifier; and, subsequent to the device authentication and the user authentication, exchanging data packets over the data channel with each data packet including a corresponding user identifier. The first encryption technique can be one of TLS and SSL, and the second encryption technique can be one of TLS and DTLS.

FIELD OF THE DISCLOSURE

The present disclosure generally relates to computer networking systemsand methods. More particularly, the present disclosure relates tocloud-based tunnel protocol systems and methods for multiple ports andprotocols.

BACKGROUND OF THE DISCLOSURE

There is a staggering growth of user devices in enterprises coupled witha shift in remote work. With this influx, Information Technology (IT)administrators can no longer ignore these user devices, remote users,etc. as simply outside their scope of responsibility. Correspondingly,there has been an unprecedented growth in the cloud services that aremade available by an enterprise to its employees, contractors, partners,etc. Traditionally, enterprises have deployed one secure application foreach service for each platform, but this has eventually failed to scalewith the growth of mobility in IT. There are myriad numbers ofcloud-based services that are being accessed from user devices acrossdiverse operating systems, uncontrolled network topologies, and vaguelyunderstood mobile geographies. Typically, enterprises have deployedapplications for a specific service, applications to access corporateresources that themselves vary for different network conditions, andapplications to secure the endpoints itself.

With the move to remote work, there is a need to efficiently supportsecurity functions for remote users (Work From Home (WFH), roadwarriors, branch offices, etc.) in a manner that avoids backhauling allof the traffic to a corporate data center. The objective is to providesuch remote users with the security functions via the cloud, and indoing so, there is a requirement to tunnel such traffic to a cloud-basedsystem efficiently.

BRIEF SUMMARY OF THE DISCLOSURE

The present disclosure relates to cloud-based tunnel protocol systemsand methods for multiple ports and protocols. Specifically, the presentdisclosure includes a tunnel that can use either Datagram TransportLayer Security (DTLS) or Transport Layer Security (TLS) to forwardpackets between user devices and a cloud service, including packets onvarious ports and having different protocols. The objective with thetunnel is to support a suite of security functions via cloud servicesfor remote users, including firewall and Intrusion Prevention System(IPS) features. The tunnel supports user-based granular policies (forweb, Secure Sockets Layer (SSL), firewall, etc.) as well as visibilityof user traffic. The tunnel uses DTLS or TLS for encryption to defendthe remote users between their network access and cloud service access.Further, the tunnel can map and identify mobile application traffic forlogging and for applying app-based granular policies.

Systems and methods include establishing a control channel of a tunnelutilizing a first encryption technique, wherein the tunnel is between alocal node including one or more processors and a remote node, andwherein the control channel includes a session identifier; establishinga data channel of the tunnel utilizing a second encryption technique,wherein the data tunnel is bound to the control channel based on thesession identifier; performing, over the control channel, deviceauthentication and user authentication of one or more users associatedwith the remote node, wherein each of the one or more users includes auser identifier; and, subsequent to the device authentication and theuser authentication, exchanging data packets over the data channel witheach data packet including a corresponding user identifier. The firstencryption technique can be one of TLS and SSL, and the secondencryption technique can be one of TLS and DTLS.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure is illustrated and described herein withreference to the various drawings, in which like reference numbers areused to denote like system components/method steps, as appropriate, andin which:

FIG. 1 is a network diagram of a cloud-based system offering security asa service;

FIG. 2 is a network diagram of an example implementation of thecloud-based system;

FIG. 3 is a block diagram of a server that may be used in thecloud-based system of FIGS. 1 and 2 or the like;

FIG. 4 is a block diagram of a user device that may be used with thecloud-based system of FIGS. 1 and 2 or the like;

FIG. 5 is a network diagram of the cloud-based system illustrating anapplication on user devices with users configured to operate through thecloud-based system;

FIG. 6 is a network diagram of a Zero Trust Network Access (ZTNA)application utilizing the cloud-based system of FIGS. 1 and 2;

FIG. 7 is a network diagram of the cloud-based system of FIGS. 1 and 2in an application of digital experience monitoring;

FIG. 8 is a network diagram of the cloud-based system of FIGS. 1 and 2with various cloud tunnels, labeled as cloud tunnels, for forwardingtraffic;

FIGS. 9 and 10 are flow diagrams of a cloud tunnel illustrating acontrol channel (FIG. 9) and a data channel (FIG. 10), with the tunnelillustrated between a client and a server; and

FIG. 11 is a flow diagram of details of a handshake process between theclient and the server.

DETAILED DESCRIPTION OF THE DISCLOSURE

Again, the present disclosure relates to cloud-based tunnel protocolsystems and methods for multiple ports and protocols. Specifically, thepresent disclosure includes a tunnel that can use either DatagramTransport Layer Security (DTLS) or Transport Layer Security (TLS) toforward packets between user devices and a cloud service, includingpackets on various ports and having different protocols. The objectivewith the tunnel is to support a suite of security functions via cloudservices for remote users, including firewall and Intrusion PreventionSystem (IPS) features. The tunnel supports user-based granular policies(for web, Secure Sockets Layer (SSL), firewall, etc.) as well asvisibility of user traffic. The tunnel uses DTLS or TLS for encryptionto defend the remote users between their network access and cloudservice access. Further, the tunnel can map and identify mobileapplication traffic for logging and for applying app-based granularpolicies.

Example Cloud-Based System Architecture

FIG. 1 is a network diagram of a cloud-based system 100 offeringsecurity as a service. Specifically, the cloud-based system 100 canoffer a Secure Internet and Web Gateway as a service to various users102, as well as other cloud services. In this manner, the cloud-basedsystem 100 is located between the users 102 and the Internet as well asany cloud services 106 (or applications) accessed by the users 102. Assuch, the cloud-based system 100 provides inline monitoring inspectingtraffic between the users 102, the Internet 104, and the cloud services106, including Secure Sockets Layer (SSL) traffic. The cloud-basedsystem 100 can offer access control, threat prevention, data protection,etc. The access control can include a cloud-based firewall, cloud-basedintrusion detection, Uniform Resource Locator (URL) filtering, bandwidthcontrol, Domain Name System (DNS) filtering, etc. The threat preventioncan include cloud-based intrusion prevention, protection againstadvanced threats (malware, spam, Cross-Site Scripting (XSS), phishing,etc.), cloud-based sandbox, antivirus, DNS security, etc. The dataprotection can include Data Loss Prevention (DLP), cloud applicationsecurity such as via Cloud Access Security Broker (CASB), file typecontrol, etc.

The cloud-based firewall can provide Deep Packet Inspection (DPI) andaccess controls across various ports and protocols as well as beingapplication and user aware. The URL filtering can block, allow, or limitwebsite access based on policy for a user, group of users, or entireorganization, including specific destinations or categories of URLs(e.g., gambling, social media, etc.). The bandwidth control can enforcebandwidth policies and prioritize critical applications such as relativeto recreational traffic. DNS filtering can control and block DNSrequests against known and malicious destinations.

The cloud-based intrusion prevention and advanced threat protection candeliver full threat protection against malicious content such as browserexploits, scripts, identified botnets and malware callbacks, etc. Thecloud-based sandbox can block zero-day exploits (just identified) byanalyzing unknown files for malicious behavior. Advantageously, thecloud-based system 100 is multi-tenant and can service a large volume ofthe users 102. As such, newly discovered threats can be promulgatedthroughout the cloud-based system 100 for all tenants practicallyinstantaneously. The antivirus protection can include antivirus,antispyware, antimalware, etc. protection for the users 102, usingsignatures sourced and constantly updated. The DNS security can identifyand route command-and-control connections to threat detection enginesfor full content inspection.

The DLP can use standard and/or custom dictionaries to continuouslymonitor the users 102, including compressed and/or SSL-encryptedtraffic. Again, being in a cloud implementation, the cloud-based system100 can scale this monitoring with near-zero latency on the users 102.The cloud application security can include CASB functionality todiscover and control user access to known and unknown cloud services106. The file type controls enable true file type control by the user,location, destination, etc. to determine which files are allowed or not.

For illustration purposes, the users 102 of the cloud-based system 100can include a mobile device 110, a headquarters (HQ) 112 which caninclude or connect to a data center (DC) 114, Internet of Things (IoT)devices 116, a branch office/remote location 118, etc., and eachincludes one or more user devices (an example user device 300 isillustrated in FIG. 3). The devices 110, 116, and the locations 112,114, 118 are shown for illustrative purposes, and those skilled in theart will recognize there are various access scenarios and other users102 for the cloud-based system 100, all of which are contemplatedherein. The users 102 can be associated with a tenant, which may includean enterprise, a corporation, an organization, etc. That is, a tenant isa group of users who share a common access with specific privileges tothe cloud-based system 100, a cloud service, etc. In an embodiment, theheadquarters 112 can include an enterprise's network with resources inthe data center 114. The mobile device 110 can be a so-called roadwarrior, i.e., users that are off-site, on-the-road, etc. Further, thecloud-based system 100 can be multi-tenant, with each tenant having itsown users 102 and configuration, policy, rules, etc. One advantage ofthe multi-tenancy and a large volume of users is the zero-day/zero-hourprotection in that a new vulnerability can be detected and theninstantly remediated across the entire cloud-based system 100. The sameapplies to policy, rule, configuration, etc. changes—they are instantlyremediated across the entire cloud-based system 100. As well, newfeatures in the cloud-based system 100 can also be rolled upsimultaneously across the user base, as opposed to selective andtime-consuming upgrades on every device at the locations 112, 114, 118,and the devices 110, 116.

Logically, the cloud-based system 100 can be viewed as an overlaynetwork between users (at the locations 112, 114, 118, and the devices110, 106) and the Internet 104 and the cloud services 106. Previously,the IT deployment model included enterprise resources and applicationsstored within the data center 114 (i.e., physical devices) behind afirewall (perimeter), accessible by employees, partners, contractors,etc. on-site or remote via Virtual Private Networks (VPNs), etc. Thecloud-based system 100 is replacing the conventional deployment model.The cloud-based system 100 can be used to implement these services inthe cloud without requiring the physical devices and management thereofby enterprise IT administrators. As an ever-present overlay network, thecloud-based system 100 can provide the same functions as the physicaldevices and/or appliances regardless of geography or location of theusers 102, as well as independent of platform, operating system, networkaccess technique, network access provider, etc.

There are various techniques to forward traffic between the users 102 atthe locations 112, 114, 118, and via the devices 110, 116, and thecloud-based system 100. Typically, the locations 112, 114, 118 can usetunneling where all traffic is forward through the cloud-based system100. For example, various tunneling protocols are contemplated, such asGeneric Routing Encapsulation (GRE), Layer Two Tunneling Protocol(L2TP), Internet Protocol (IP) Security (IPsec), customized tunnelingprotocols, etc. The devices 110, 116 can use a local application thatforwards traffic, a proxy such as via a Proxy Auto-Config (PAC) file,and the like. A key aspect of the cloud-based system 100 is all trafficbetween the users 102 and the Internet 104 or the cloud services 106 isvia the cloud-based system 100. As such, the cloud-based system 100 hasvisibility to enable various functions, all of which are performed offthe user device in the cloud.

The cloud-based system 100 can also include a management system 120 fortenant access to provide global policy and configuration as well asreal-time analytics. This enables IT administrators to have a unifiedview of user activity, threat intelligence, application usage, etc. Forexample, IT administrators can drill-down to a per-user level tounderstand events and correlate threats, to identify compromiseddevices, to have application visibility, and the like. The cloud-basedsystem 100 can further include connectivity to an Identity Provider(IDP) 122 for authentication of the users 102 and to a SecurityInformation and Event Management (SIEM) system 124 for event logging.The system 124 can provide alert and activity logs on a per-user 102basis.

FIG. 2 is a network diagram of an example implementation of thecloud-based system 100. In an embodiment, the cloud-based system 100includes a plurality of enforcement nodes (EN) 150, labeled asenforcement nodes 150-1, 150-2, 150-N, interconnected to one another andinterconnected to a central authority (CA) 152. The nodes 150, 152,while described as nodes, can include one or more servers, includingphysical servers, virtual machines (VM) executed on physical hardware,etc. That is, a single node 150, 152 can be a cluster of devices. Anexample of a server is illustrated in FIG. 2. The cloud-based system 100further includes a log router 154 that connects to a storage cluster 156for supporting log maintenance from the enforcement nodes 150. Thecentral authority 152 provide centralized policy, real-time threatupdates, etc. and coordinates the distribution of this data between theenforcement nodes 150. The enforcement nodes 150 provide an onramp tothe users 102 and are configured to execute policy, based on the centralauthority 152, for each user 102. The enforcement nodes 150 can begeographically distributed, and the policy for each user 102 followsthat user 102 as he or she connects to the nearest (or other criteria)enforcement node 150.

The enforcement nodes 150 are full-featured secure internet gatewaysthat provide integrated internet security. They inspect all web trafficbi-directionally for malware and enforce security, compliance, andfirewall policies, as described herein. In an embodiment, eachenforcement node 150 has two main modules for inspecting traffic andapplying policies: a web module and a firewall module. The enforcementnodes 150 are deployed around the world and can handle hundreds ofthousands of concurrent users with millions of concurrent sessions.Because of this, regardless of where the users 102 are, they can accessthe Internet 104 from any device, and the enforcement nodes 150 protectthe traffic and apply corporate policies. The enforcement nodes 150 canimplement various inspection engines therein, and optionally, sendsandboxing to another system. The enforcement nodes 150 includesignificant fault tolerance capabilities, such as deployment inactive-active mode to ensure availability and redundancy as well ascontinuous monitoring.

In an embodiment, customer traffic is not passed to any other componentwithin the cloud-based system 100, and the enforcement nodes 150 can beconfigured never to store any data to disk. Packet data is held inmemory for inspection and then, based on policy, is either forwarded ordropped. Log data generated for every transaction is compressed,tokenized, and exported over secure TLS connections to the log routers154 that direct the logs to the storage cluster 156, hosted in theappropriate geographical region, for each organization.

The central authority 152 hosts all customer (tenant) policy andconfiguration settings. It monitors the cloud and provides a centrallocation for software and database updates and threat intelligence.Given the multi-tenant architecture, the central authority 152 isredundant and backed up in multiple different data centers. Theenforcement nodes 150 establish persistent connections to the centralauthority 152 to download all policy configurations. When a new userconnects to an enforcement node 150, a policy request is sent to thecentral authority 152 through this connection. The central authority 152then calculates the policies that apply to that user 102 and sends thepolicy to the enforcement node 150 as a highly compressed bitmap.

Once downloaded, a tenant's policy is cached until a policy change ismade in the management system 120. When this happens, all of the cachedpolicies are purged, and the enforcement nodes 150 request the newpolicy when the user 102 next makes a request. In an embodiment, theenforcement node 150 exchange “heartbeats” periodically, so allenforcement nodes 150 are informed when there is a policy change. Anyenforcement node 150 can then pull the change in policy when it sees anew request.

The cloud-based system 100 can be a private cloud, a public cloud, acombination of a private cloud and a public cloud (hybrid cloud), or thelike. Cloud computing systems and methods abstract away physicalservers, storage, networking, etc., and instead offer these as on-demandand elastic resources. The National Institute of Standards andTechnology (NIST) provides a concise and specific definition whichstates cloud computing is a model for enabling convenient, on-demandnetwork access to a shared pool of configurable computing resources(e.g., networks, servers, storage, applications, and services) that canbe rapidly provisioned and released with minimal management effort orservice provider interaction. Cloud computing differs from the classicclient-server model by providing applications from a server that areexecuted and managed by a client's web browser or the like, with noinstalled client version of an application required. Centralizationgives cloud service providers complete control over the versions of thebrowser-based and other applications provided to clients, which removesthe need for version upgrades or license management on individual clientcomputing devices. The phrase “Software as a Service” (SaaS) issometimes used to describe application programs offered through cloudcomputing. A common shorthand for a provided cloud computing service (oreven an aggregation of all existing cloud services) is “the cloud.” Thecloud-based system 100 is illustrated herein as an example embodiment ofa cloud-based system, and other implementations are also contemplated.

As described herein, the terms cloud services and cloud applications maybe used interchangeably. The cloud service 106 is any service madeavailable to users on-demand via the Internet, as opposed to beingprovided from a company's on-premises servers. A cloud application, orcloud app, is a software program where cloud-based and local componentswork together. The cloud-based system 100 can be utilized to provideexample cloud services, including Zscaler Internet Access (ZIA), ZscalerPrivate Access (ZPA), and Zscaler Digital Experience (ZDX), all fromZscaler, Inc. (the assignee and applicant of the present application).The ZIA service can provide the access control, threat prevention, anddata protection described above with reference to the cloud-based system100. ZPA can include access control, microservice segmentation, etc. TheZDX service can provide monitoring of user experience, e.g., Quality ofExperience (QoE), Quality of Service (QoS), etc., in a manner that cangain insights based on continuous, inline monitoring. For example, theZIA service can provide a user with Internet Access, and the ZPA servicecan provide a user with access to enterprise resources instead oftraditional Virtual Private Networks (VPNs), namely ZPA provides ZeroTrust Network Access (ZTNA). Those of ordinary skill in the art willrecognize various other types of cloud services 106 are alsocontemplated. Also, other types of cloud architectures are alsocontemplated, with the cloud-based system 100 presented for illustrationpurposes.

Example Server Architecture

FIG. 3 is a block diagram of a server 200, which may be used in thecloud-based system 100, in other systems, or standalone. For example,the enforcement nodes 150 and the central authority 152 may be formed asone or more of the servers 200. The server 200 may be a digital computerthat, in terms of hardware architecture, generally includes a processor202, input/output (I/O) interfaces 204, a network interface 206, a datastore 208, and memory 210. It should be appreciated by those of ordinaryskill in the art that FIG. 3 depicts the server 200 in an oversimplifiedmanner, and a practical embodiment may include additional components andsuitably configured processing logic to support known or conventionaloperating features that are not described in detail herein. Thecomponents (202, 204, 206, 208, and 210) are communicatively coupled viaa local interface 212. The local interface 212 may be, for example, butnot limited to, one or more buses or other wired or wirelessconnections, as is known in the art. The local interface 212 may haveadditional elements, which are omitted for simplicity, such ascontrollers, buffers (caches), drivers, repeaters, and receivers, amongmany others, to enable communications. Further, the local interface 212may include address, control, and/or data connections to enableappropriate communications among the aforementioned components.

The processor 202 is a hardware device for executing softwareinstructions. The processor 202 may be any custom made or commerciallyavailable processor, a Central Processing Unit (CPU), an auxiliaryprocessor among several processors associated with the server 200, asemiconductor-based microprocessor (in the form of a microchip orchipset), or generally any device for executing software instructions.When the server 200 is in operation, the processor 202 is configured toexecute software stored within the memory 210, to communicate data toand from the memory 210, and to generally control operations of theserver 200 pursuant to the software instructions. The I/O interfaces 204may be used to receive user input from and/or for providing systemoutput to one or more devices or components.

The network interface 206 may be used to enable the server 200 tocommunicate on a network, such as the Internet 104. The networkinterface 206 may include, for example, an Ethernet card or adapter or aWireless Local Area Network (WLAN) card or adapter. The networkinterface 206 may include address, control, and/or data connections toenable appropriate communications on the network. A data store 208 maybe used to store data. The data store 208 may include any of volatilememory elements (e.g., random access memory (RAM, such as DRAM, SRAM,SDRAM, and the like)), nonvolatile memory elements (e.g., ROM, harddrive, tape, CDROM, and the like), and combinations thereof. Moreover,the data store 208 may incorporate electronic, magnetic, optical, and/orother types of storage media. In one example, the data store 208 may belocated internal to the server 200, such as, for example, an internalhard drive connected to the local interface 212 in the server 200.Additionally, in another embodiment, the data store 208 may be locatedexternal to the server 200 such as, for example, an external hard driveconnected to the I/O interfaces 204 (e.g., SCSI or USB connection). In afurther embodiment, the data store 208 may be connected to the server200 through a network, such as, for example, a network-attached fileserver.

The memory 210 may include any of volatile memory elements (e.g., randomaccess memory (RAM, such as DRAM, SRAM, SDRAM, etc.)), nonvolatilememory elements (e.g., ROM, hard drive, tape, CDROM, etc.), andcombinations thereof. Moreover, the memory 210 may incorporateelectronic, magnetic, optical, and/or other types of storage media. Notethat the memory 210 may have a distributed architecture, where variouscomponents are situated remotely from one another but can be accessed bythe processor 202. The software in memory 210 may include one or moresoftware programs, each of which includes an ordered listing ofexecutable instructions for implementing logical functions. The softwarein the memory 210 includes a suitable Operating System (O/S) 214 and oneor more programs 216. The operating system 214 essentially controls theexecution of other computer programs, such as the one or more programs216, and provides scheduling, input-output control, file and datamanagement, memory management, and communication control and relatedservices. The one or more programs 216 may be configured to implementthe various processes, algorithms, methods, techniques, etc. describedherein.

Example User Device Architecture

FIG. 4 is a block diagram of a user device 300, which may be used withthe cloud-based system 100 or the like. Specifically, the user device300 can form a device used by one of the users 102, and this may includecommon devices such as laptops, smartphones, tablets, netbooks, personaldigital assistants, MP3 players, cell phones, e-book readers, IoTdevices, servers, desktops, printers, televisions, streaming mediadevices, and the like. The user device 300 can be a digital device that,in terms of hardware architecture, generally includes a processor 302,I/O interfaces 304, a network interface 306, a data store 308, andmemory 310. It should be appreciated by those of ordinary skill in theart that FIG. 4 depicts the user device 300 in an oversimplified manner,and a practical embodiment may include additional components andsuitably configured processing logic to support known or conventionaloperating features that are not described in detail herein. Thecomponents (302, 304, 306, 308, and 302) are communicatively coupled viaa local interface 312. The local interface 312 can be, for example, butnot limited to, one or more buses or other wired or wirelessconnections, as is known in the art. The local interface 312 can haveadditional elements, which are omitted for simplicity, such ascontrollers, buffers (caches), drivers, repeaters, and receivers, amongmany others, to enable communications. Further, the local interface 312may include address, control, and/or data connections to enableappropriate communications among the aforementioned components.

The processor 302 is a hardware device for executing softwareinstructions. The processor 302 can be any custom made or commerciallyavailable processor, a CPU, an auxiliary processor among severalprocessors associated with the user device 300, a semiconductor-basedmicroprocessor (in the form of a microchip or chipset), or generally anydevice for executing software instructions. When the user device 300 isin operation, the processor 302 is configured to execute software storedwithin the memory 310, to communicate data to and from the memory 310,and to generally control operations of the user device 300 pursuant tothe software instructions. In an embodiment, the processor 302 mayinclude a mobile-optimized processor such as optimized for powerconsumption and mobile applications. The I/O interfaces 304 can be usedto receive user input from and/or for providing system output. Userinput can be provided via, for example, a keypad, a touch screen, ascroll ball, a scroll bar, buttons, a barcode scanner, and the like.System output can be provided via a display device such as a LiquidCrystal Display (LCD), touch screen, and the like.

The network interface 306 enables wireless communication to an externalaccess device or network. Any number of suitable wireless datacommunication protocols, techniques, or methodologies can be supportedby the network interface 306, including any protocols for wirelesscommunication. The data store 308 may be used to store data. The datastore 308 may include any of volatile memory elements (e.g., randomaccess memory (RAM, such as DRAM, SRAM, SDRAM, and the like)),nonvolatile memory elements (e.g., ROM, hard drive, tape, CDROM, and thelike), and combinations thereof. Moreover, the data store 308 mayincorporate electronic, magnetic, optical, and/or other types of storagemedia.

The memory 310 may include any of volatile memory elements (e.g., randomaccess memory (RAM, such as DRAM, SRAM, SDRAM, etc.)), nonvolatilememory elements (e.g., ROM, hard drive, etc.), and combinations thereof.Moreover, the memory 310 may incorporate electronic, magnetic, optical,and/or other types of storage media. Note that the memory 310 may have adistributed architecture, where various components are situated remotelyfrom one another, but can be accessed by the processor 302. The softwarein memory 310 can include one or more software programs, each of whichincludes an ordered listing of executable instructions for implementinglogical functions. In the example of FIG. 3, the software in the memory310 includes a suitable operating system 314 and programs 316. Theoperating system 314 essentially controls the execution of othercomputer programs and provides scheduling, input-output control, fileand data management, memory management, and communication control andrelated services. The programs 316 may include various applications,add-ons, etc. configured to provide end-user functionality with the userdevice 300. For example, example programs 316 may include, but notlimited to, a web browser, social networking applications, streamingmedia applications, games, mapping and location applications, electronicmail applications, financial applications, and the like. In a typicalexample, the end-user typically uses one or more of the programs 316along with a network such as the cloud-based system 100.

User Device Application for Traffic Forwarding and Monitoring

FIG. 5 is a network diagram of the cloud-based system 100 illustratingan application 350 on user devices 300 with users 102 configured tooperate through the cloud-based system 100. Different types of userdevices 300 are proliferating, including Bring Your Own Device (BYOD) aswell as IT-managed devices. The conventional approach for a user device300 to operate with the cloud-based system 100 as well as for accessingenterprise resources includes complex policies, VPNs, poor userexperience, etc. The application 350 can automatically forward usertraffic with the cloud-based system 100 as well as ensuring thatsecurity and access policies are enforced, regardless of device,location, operating system, or application. The application 350automatically determines if a user 102 is looking to access the openInternet 104, a SaaS app, or an internal app running in public, private,or the datacenter and routes mobile traffic through the cloud-basedsystem 100. The application 350 can support various cloud services,including ZIA, ZPA, ZDX, etc., allowing the best in class security withzero trust access to internal apps.

The application 350 is configured to auto-route traffic for a seamlessuser experience. This can be protocol as well as application-specific,and the application 350 can route traffic with a nearest or best fitenforcement node 150. Further, the application 350 can detect trustednetworks, allowed applications, etc. and support secure network access.The application 350 can also support the enrollment of the user device300 before accessing applications. The application 350 can uniquelydetect the users 102 based on fingerprinting the user device 300, usingcriteria like device model, platform, operating system, etc. Theapplication 350 can support Mobile Device Management (MDM) functions,allowing IT personnel to deploy and manage the user devices 300seamlessly. This can also include the automatic installation of clientand SSL certificates during enrollment. Finally, the application 350provides visibility into device and app usage of the user 102 of theuser device 300.

The application 350 supports a secure, lightweight tunnel between theuser device 300 and the cloud-based system 100. For example, thelightweight tunnel can be HTTP-based. With the application 350, there isno requirement for PAC files, an IPSec VPN, authentication cookies, orend user 102 setup.

Zero Trust Network Access Using the Cloud-Based System

FIG. 6 is a network diagram of a Zero Trust Network Access (ZTNA)application utilizing the cloud-based system 100. For ZTNA, thecloud-based system 100 can dynamically create a connection through asecure tunnel between an endpoint (e.g., users 102A, 102B) that areremote and an on-premises connector 400 that is either located in cloudfile shares and applications 402 and/or in an enterprise network 404,connected to enterprise file shares and applications. The connectionbetween the cloud-based system 100 and on-premises connector 400 isdynamic, on-demand, and orchestrated by the cloud-based system 100. Akey feature is its security at the edge—there is no need to punch anyholes in the existing on-premises firewall. The connector 400 inside theenterprise (on-premises) “dials out” and connects to the cloud-basedsystem 100 as if too were an endpoint. This on-demand dial-outcapability and tunneling authenticated traffic back to the enterprise isa key differentiator for ZTNA. Also, this functionality can beimplemented in part by the application 350 on the user device 300.

The paradigm of virtual private access systems and methods is to giveusers network access to get to an application and/or file share, not tothe entire network. If a user is not authorized to get the application,the user should not be able even to see that it exists, much less accessit. The virtual private access systems and methods provide an approachto deliver secure access by decoupling applications 402, 404 from thenetwork, instead of providing access with a connector 400, in front ofthe applications 402, 404, an application on the user device 300, acentral authority node 152 to push policy 410, and the cloud-basedsystem 100 to stitch the applications 402, 404 and the softwareconnectors 402, 404 together, on a per-user, per-application basis.

With the virtual private access, users can only see the specificapplications 402, 404 allowed by the policy 410. Everything else is“invisible” or “dark” to them. Because the virtual private accessseparates the application from the network, the physical location of theapplication 402, 404 becomes irrelevant—if applications 402, 404 arelocated in more than one place, the user is automatically directed tothe instance that will give them the best performance. The virtualprivate access also dramatically reduces configuration complexity, suchas policies/firewalls in the data centers. Enterprises can, for example,move applications to Amazon Web Services or Microsoft Azure, and takeadvantage of the elasticity of the cloud, making private, internalapplications behave just like the marketing leading enterpriseapplications. Advantageously, there is no hardware to buy or deploy,because the virtual private access is a service offering to end-usersand enterprises. FIG. 5 can include the ZPA service from Zscaler, Inc.

Digital Experience Monitoring

FIG. 7 is a network diagram of the cloud-based system 100 in anapplication of digital experience monitoring. Here, the cloud-basedsystem 100 providing security as a service as well as ZTNA, can also beused to provide real-time, continuous digital experience monitoring, asopposed to conventional approaches (synthetic probes). A key aspect ofthe architecture of the cloud-based system 100 is the inline monitoring.This means data is accessible in real-time for individual users fromend-to-end. As described herein, digital experience monitoring caninclude monitoring, analyzing, and improving the digital userexperience.

The cloud-based system 100 connects users 102 at the locations 110, 112,118 to the applications 402, 404, the Internet 104, the cloud services106, etc. The inline, end-to-end visibility of all users enables digitalexperience monitoring. The cloud-based system 100 can monitor, diagnose,generate alerts, and perform remedial actions with respect to networkendpoints, network components, network links, etc. The network endpointscan include servers, virtual machines, containers, storage systems, oranything with an IP address, including the Internet of Things (IoT),cloud, and wireless endpoints. With these components, these networkendpoints can be monitored directly in combination with a networkperspective. Thus, the cloud-based system 100 provides a uniquearchitecture that can enable digital experience monitoring, networkapplication monitoring, infrastructure component interactions, etc. Ofnote, these various monitoring aspects require no additionalcomponents—the cloud-based system 100 leverages the existinginfrastructure to provide this service.

Again, digital experience monitoring includes the capture of data abouthow end-to-end application availability, latency, and quality appear tothe end user from a network perspective. This is limited to the networktraffic visibility and not within components, such as what applicationperformance monitoring can accomplish. Networked application monitoringprovides the speed and overall quality of networked application deliveryto the user in support of key business activities. Infrastructurecomponent interactions include a focus on infrastructure components asthey interact via the network, as well as the network delivery ofservices or applications. This includes the ability to provide networkpath analytics.

The cloud-based system 100 can enable real-time performance andbehaviors for troubleshooting in the current state of the environment,historical performance and behaviors to understand what occurred or whatis trending over time, predictive behaviors by leveraging analyticstechnologies to distill and create actionable items from the largedataset collected across the various data sources, and the like. Thecloud-based system 100 includes the ability to directly ingest any ofthe following data sources network device-generated health data, networkdevice-generated traffic data, including flow-based data sourcesinclusive of NetFlow and IPFIX, raw network packet analysis to identifyapplication types and performance characteristics, HTTP request metrics,etc. The cloud-based system 100 can operate at 10 gigabits (10G)Ethernet and higher at full line rate and support a rate of 100,000 ormore flows per second or higher.

The applications 402, 404 can include enterprise applications, Office365, Salesforce, Skype, Google apps, internal applications, etc. Theseare critical business applications where user experience is important.The objective here is to collect various data points so that userexperience can be quantified for a particular user, at a particulartime, for purposes of analyzing the experience as well as improving theexperience. In an embodiment, the monitored data can be from differentcategories, including application-related, network-related,device-related (also can be referred to as endpoint-related),protocol-related, etc. Data can be collected at the application 350 orthe cloud edge to quantify user experience for specific applications,i.e., the application-related and device-related data. The cloud-basedsystem 100 can further collect the network-related and theprotocol-related data (e.g., Domain Name System (DNS) response time).

Application-Related Data

Page Load Time Redirect count (#) Page Response Time Throughput (bps)Document Object Model (DOM) Total size (bytes) Load Time TotalDownloaded bytes Page error count (#) App availability (%) Page elementcount by category (#)

Network-Related Data

HTTP Request metrics Bandwidth Server response time Jitter Ping packetloss (%) Trace Route Ping round trip DNS lookup trace Packet loss (%)GRE/IPSec tunnel monitoring Latency MTU and bandwidth measurements

Device-Related Data (Endpoint-Related Data)

System details Network (config) Central Processing Unit (CPU) DiskMemory (RAM) Processes Network (interfaces) Applications

Metrics could be combined. For example, device health can be based on acombination of CPU, memory, etc. Network health could be a combinationof Wi-Fi/LAN connection health, latency, etc. Application health couldbe a combination of response time, page loads, etc. The cloud-basedsystem 100 can generate service health as a combination of CPU, memory,and the load time of the service while processing a user's request. Thenetwork health could be based on the number of network path(s), latency,packet loss, etc.

The lightweight connector 400 can also generate similar metrics for theapplications 402, 404. In an embodiment, the metrics can be collectedwhile a user is accessing specific applications that user experience isdesired for monitoring. In another embodiment, the metrics can beenriched by triggering synthetic measurements in the context of aninline transaction by the application 350 or cloud edge. The metrics canbe tagged with metadata (user, time, app, etc.) and sent to a loggingand analytics service for aggregation, analysis, and reporting. Further,network administrators can get UEX reports from the cloud-based system100. Due to the inline nature and the fact the cloud-based system 100 isan overlay (in-between users and services/applications), the cloud-basedsystem 100 enables the ability to capture user experience metric datacontinuously and to log such data historically. As such, a networkadministrator can have a long-term detailed view of the network andassociated user experience.

Cloud Tunnel

FIG. 8 is a network diagram of the cloud-based system 100 with variouscloud tunnels 500, labeled as cloud tunnels 500A, 500B, 500C, forforwarding traffic. FIGS. 9 and 10 are flow diagrams of a cloud tunnel500 illustrating a control channel (FIG. 9) and a data channel (FIG.10), with the tunnel illustrated between a client 510 and a server 520.The cloud tunnel 500 is a lightweight tunnel that is configured toforward traffic between the client 510 and the server 520. The presentdisclosure focuses on the specific mechanisms used in the cloud tunnel500 between two points, namely the client 510 and the server 520. Thoseskilled in the art will recognize the cloud tunnel 500 can be used withthe cloud-based system 100 as an example use case, and other uses arecontemplated. That is, the client 510 and the server 520 are justendpoint devices that support the exchange of data traffic and controltraffic for the tunnel 500. For description, the server 520 can bereferred to as a local node and the client 510 as a remote node, wherethe tunnel operates between the local and remote nodes.

In an embodiment, the cloud-based system 100 can use the cloud tunnel500 to forward traffic to the enforcement nodes 150, such as from a userdevice 300 with the application 350, from a branch office/remotelocation 118, etc. FIG. 8 illustrates three example use cases for thecloud tunnel 500 with the cloud-based system 100, and other uses arealso contemplated. In a first use case, a cloud tunnel 500A is formedbetween a user device 300, such as with the application 350, and anenforcement node 150-1. For example, when a user 102 associated with theuser device 300 connects to a network, the application 350 can establishthe cloud tunnel 500A to the closest or best enforcement node 150-1, andforward the traffic through the cloud tunnel 500A so that theenforcement node 150-1 can apply the appropriate security and accesspolicies. Here, the cloud tunnel 500A supports a single user 102,associated with the user device 300.

In a second use case, a cloud tunnel 500B is formed between a VirtualNetwork Function (VNF) 1102 or some other device at a remote location118A and an enforcement node 150-2. Here, the VNF 1102 is used toforward traffic from any user 102 at the remote location 118A to theenforcement node 150-2. In a third use case, a cloud tunnel 110C isformed between an on-premises enforcement node, referred to as an EdgeConnector (EC) 150A, and an enforcement node 150-N. The edge connector150A can be located at a branch office 118A or the like. In someembodiments, the edge connector 150A can be an enforcement node 150 inthe cloud-based system 100 but located on-premises with a tenant. Here,in the second and third use cases, the cloud tunnels 500B, 500C supportmultiple users 102.

There can be two versions of the cloud tunnel 500, referred to a tunnel1 and tunnel 2. The tunnel 1 can only support Web protocols as an HTTPconnect tunnel operating on a TCP streams. That is, the tunnel 1 cansend all proxy-aware traffic or port 80/443 traffic to the enforcementnode 150, depending on the forwarding profile configuration. This can beperformed via CONNECT requests, similar to a traditional proxy.

The tunnel 2 can support multiple ports and protocols, extending beyondonly web protocols. As described herein, the cloud tunnels 500 are thetunnel 2. In all of the use cases, the cloud tunnel 500 enables eachuser device 300 to redirect traffic destined to all ports and protocolsto a corresponding enforcement node 150. Note, the cloud-based system100 can include load balancing functionality to spread the cloud tunnels500 from a single source IP address. The cloud tunnel 500 supportsdevice logging for all traffic, firewall, etc., such as in the storagecluster 156. The cloud tunnel 500 utilizes encryption, such as via TLSor DTLS, to tunnel packets between the two points, namely the client 510and the server 520. As described herein, the client 510 can be the userdevice 300, the VNF 1102, and/or the edge connector 150A, and the server520 can be the enforcement node 150. Again, other devices arecontemplated with the cloud tunnel 500.

The cloud tunnel 500 can use a Network Address Translation (NAT) devicethat does not require a different egress IP for each device's 300separate sessions. Again, the cloud tunnel 500 has a tunnelingarchitecture that uses DTLS or TLS to send packets to the cloud-basedsystem 100. Because of this, the cloud tunnel 500 is capable of sendingtraffic from all ports and protocols.

Thus, the cloud tunnel 500 provides complete protection for a singleuser 102, via the application 350, as well as for multiple users atremote locations 118, including multiple security functions such ascloud firewall, cloud IPS, etc. The cloud tunnel 500 includes user-levelgranularity of the traffic, enabling different users 102 on the samecloud tunnel 500 for the enforcement nodes 150 to provide user-basedgranular policy and visibility. In addition to user-level granularity,the cloud tunnel 500 can provide application-level granularity, such asby mapping mobile applications (e.g., Facebook, Gmail, etc.) to traffic,allowing for app-based granular policies.

FIGS. 9 and 10 illustrate the two communication channels, namely acontrol channel 530 and a data channel 540, between the client 510 andthe server 520. Together, these two communication channels 530, 540 formthe cloud tunnel 500. In an embodiment, the control channel 530 can bean encrypted TLS connection or SSL connection, and the control channel530 is used for device and/or user authentication and other controlmessages. In an embodiment, the data channel 540 can be an encryptedDTLS or TLS connection, i.e., the data channel can be one or more DTLSor TLS connections for the transmit and receive of user IP packets.There can be multiple data channels 540 associated with the same controlchannel 530. The data channel 540 can be authenticated using a SessionIdentifier (ID) from the control channel 530.

Of note, the control channel 530 always uses TLS because some locations(e.g., the remote location 118A, the branch office 118B, otherenterprises, hotspots, etc.) can block UDP port 443, preventing DTLS.Whereas TLS is widely used and not typically blocked. The data channel540 preferably uses DTLS, if it is available, i.e., not blocked on theclient 530. If it is blocked, the data channel 540 can use TLS instead.For example, DTLS is the primary protocol for the data channel 540 withTLS used as a fallback over TCP port 443 if DTLS is unavailable, namelyif UDP port 443 is blocked at the client 530.

In FIG. 9, the control channel 530 is illustrated with exchanges betweenthe client 510 and the server 520. Again, the control channel 530includes TLS encryption, which is established through a setup orhandshake between the client 510 and the server 520 (step 550-1). Anexample of a handshake is illustrated in FIG. 11. The client 510 cansend its version of the tunnel 500 to the server 520 (step 550-2) towhich the server 520 can acknowledge (step 550-3). For example, theversion of the tunnel can include a simple version number or otherindication, as well as an indication of whether the client 510 supportsDTLS for the data channel 540. Again, the control channel 530 is fixedwith TLS or SSL, but the data channel 540 can be either DTLS or TLS.

The client 510 can perform device authentication (step 550-4), and theserver 520 can acknowledge the device authentication (step 550-5). Theclient 510 can perform user authentication (step 550-6), and the server520 can acknowledge the user authentication (step 550-7). Note, thedevice authentication includes authenticating the user device 300, suchas via the application 350, the VNF 502, the edge connector 150A, etc.The user authentication includes authenticating the users 102 associatedwith the user devices 300. Note, in an embodiment, the client 510 is thesole device 300, and here the user authentication can be for the user102 associated with the client 510, and the device authentication can befor the user device 300 with the application 350. In another embodiment,the client 510 can have multiple user devices 300 and correspondingusers 102 associated with it. Here, the device authentication can be forthe VNF 502, the edge connector 150A, etc., and the user authenticationcan be for each user device 300 and corresponding user 102, and theclient 510 and the server 520 can have a unique identifier for each userdevice 300, for user-level identification.

The device authentication acknowledgment can include a sessionidentifier (ID) that is used to bind the control channel 530 with one ormore data channels 540. The user authentication can be based on a useridentifier (ID) that is unique to each user 102. The client 510 canperiodically provide keep alive packets (step 550-8), and the server 510can respond with keep alive acknowledgment packets (step 550-9). Theclient 510 and the server 520 can use the keep alive packets or messagesto maintain the control channel 530. Also, the client 510 and the server520 can exchange other relevant data over the control channel 530, suchas metadata, which identifies an application for a user 102, locationinformation for a user device 300, etc.

In FIG. 10, similar to FIG. 9, the data channel 540 is illustrated withexchanges between the client 510 and the server 520. Again, the datachannel 540 includes TLS or DTLS encryption, which is establishedthrough a setup or handshake between the client 510 and the server 520(step 560-1). An example of a handshake is illustrated in FIG. 11. Note,the determination of whether to use TLS or DTLS is based on the sessionID, which is part of the device authentication acknowledgment, and whichis provided over the data channel 540 (steps 560-2, 560-3). Here, theclient 510 has told the server 520 its capabilities, and the session IDreflects what the server 520 has chosen, namely TLS or DTLS, based onthe client's 510 capabilities. In an embodiment, the server 520 choosesDTLS if the client 510 supports it, i.e., if UDP port 443 is notblocked, otherwise the server 520 chooses TLS. Accordingly, the controlchannel 530 is established before the data channel 540. The data channel540 can be authenticated based on the session ID from the controlchannel 530.

The data channel 540 includes the exchange of data packets between theclient 510 and the server 520 (step 560-4). The data packets include anidentifier such as the session ID and a user ID for the associated user102. Additionally, the data channel 540 can include keep alive packetsbetween the client 510 and the server 520 (steps 560-5, 560-6).

The cloud tunnel 500 can support load balancing functionality betweenthe client 510 and the server 520. The server 520 can be in a cluster,i.e., multiple servers 200. For example, the server 520 can be anenforcement node 150 cluster in the cloud-based system 100. Becausethere can be multiple data channels 540 for a single control channel530, it is possible to have the multiple data channels 540, in a singlecloud tunnel 500, connected to different physical servers 200 in acluster. Thus, the cloud-based system 100 can include load balancingfunctionality to spread the cloud tunnels 500 from a single source IPaddress, i.e., the client 510.

Also, the use of DTLS for the data channels 540 allows the user devices300 to switch networks without potentially impacting the traffic goingthrough the tunnel 500. For example, a large file download couldcontinue uninterrupted when a user device 300 moves from Wi-Fi tomobile, etc. Here, the application 350 can add some proprietary data tothe DTLS client-hello servername extension. That proprietary data helpsa load balancer balance the new DTLS connection to the same server 200in a cluster where the connection prior to network change was beingprocessed. So, a newly established DTLS connection with different IPaddress (due to network change) can be used to tunnel packets of thelarge file download that was started before the network change. Also,some mobile carriers use different IP addresses for TCP/TLS (controlchannel) and UDP/DTLS (data channel) flows. The data in DTLSclient-hello helps the load balancer balance the control and dataconnection to the same server 200 in the cluster.

User and Application-Level Awareness

The tunnel 500 is aware of every user based on the user ID, which isassociated with data packets on the data channel 540. This allows thecloud-based system 100 to apply per user-level functions on data trafficwhere there are multiple users 102 on the tunnel 500. In anotherembodiment, a user 102 can be operating a mobile device for the userdevice 300. Many mobile apps are not differentiated in transit. Here, inan embodiment, the application 350 can have the ability to dumpoperating system network connection tables, derive application orprocess (names) associated with established connections (TCP/UDP), andtag ab application ID on every packet over the data channel 540. In sucha manner, the tunnel 500 can support both per user and perapplication-level awareness.

Encryption Handshake Process

FIG. 11 is a flow diagram of details of a handshake process 600 betweenthe client 510 and the server 520. Again, the client 510 and the server520 are labeled as such but could be any two endpoints of a cloud tunnel500. The client 510 sends a “client hello” message that listscryptographic information such as the SSL/TLS/DTLS version and, in theclient's order of preference, the CipherSuites supported by the client510 (step 610-1). The message also contains a random byte string that isused in subsequent computations. The protocol allows for the “clienthello” to include the data compression methods supported by the client510.

The server 520 responds with a “server hello” message that contains theCipherSuite chosen by the server 520 from the list provided by theclient 510, the session ID, and another random byte string (step 610-2).The server 520 also sends its digital certificate. If the server 520requires a digital certificate for client authentication, the server 520sends a “client certificate request” that includes a list of the typesof certificates supported and the Distinguished Names of acceptable CAs.The client 510 verifies the server's 520 digital certificates (step610-3).

The client 510 sends the random byte string that enables both the client510 and the server 520 to compute the secret key to be used forencrypting subsequent message data (step 510-4). The random byte stringitself is encrypted with the server's 520 public key. In an embodiment,for the data channel 540, the random byte string can be the session ID,which of course, is not random. If the server 520 sent a “clientcertificate request,” the client 510 sends a random byte stringencrypted with the client's private key, together with the client's 510digital certificates, or a “no digital certificate alert” (step 610-5).This alert is only a warning, but with some implementations, thehandshake fails if client authentication is mandatory. The server 520verifies the client's certificate if required (step 610-6).

The client 510 sends the server a “finished” message, which is encryptedwith the secret key, indicating that the client 510 part of thehandshake is complete (step 610-7). The server 520 sends the client 510a “finished” message, which is encrypted with the secret key, indicatingthat the server 520 part of the handshake is complete. For the durationof the session, the server 520 and client 510 can now exchange messagesthat are symmetrically encrypted with the shared secret key (step610-9).

It will be appreciated that some embodiments described herein mayinclude one or more generic or specialized processors (“one or moreprocessors”) such as microprocessors; Central Processing Units (CPUs);Digital Signal Processors (DSPs): customized processors such as NetworkProcessors (NPs) or Network Processing Units (NPUs), Graphics ProcessingUnits (GPUs), or the like; Field Programmable Gate Arrays (FPGAs); andthe like along with unique stored program instructions (including bothsoftware and firmware) for control thereof to implement, in conjunctionwith certain non-processor circuits, some, most, or all of the functionsof the methods and/or systems described herein. Alternatively, some orall functions may be implemented by a state machine that has no storedprogram instructions, or in one or more Application-Specific IntegratedCircuits (ASICs), in which each function or some combinations of certainof the functions are implemented as custom logic or circuitry. Ofcourse, a combination of the aforementioned approaches may be used. Forsome of the embodiments described herein, a corresponding device such ashardware, software, firmware, and a combination thereof can be referredto as “circuitry configured or adapted to,” “logic configured or adaptedto,” etc. perform a set of operations, steps, methods, processes,algorithms, functions, techniques, etc. as described herein for thevarious embodiments.

Moreover, some embodiments may include a non-transitorycomputer-readable storage medium having computer-readable code storedthereon for programming a computer, server, appliance, device,processor, circuit, etc. each of which may include a processor toperform functions as described and claimed herein. Examples of suchcomputer-readable storage mediums include, but are not limited to, ahard disk, an optical storage device, a magnetic storage device, a ROM(Read Only Memory), a PROM (Programmable Read-Only Memory), an EPROM(Erasable Programmable Read-Only Memory), an EEPROM (ElectricallyErasable Programmable Read-Only Memory), Flash memory, and the like.When stored in the non-transitory computer-readable medium, the softwarecan include instructions executable by a processor or device (e.g., anytype of programmable circuitry or logic) that, in response to suchexecution, cause a processor or the device to perform a set ofoperations, steps, methods, processes, algorithms, functions,techniques, etc. as described herein for the various embodiments.

Although the present disclosure has been illustrated and describedherein with reference to preferred embodiments and specific examplesthereof, it will be readily apparent to those of ordinary skill in theart that other embodiments and examples may perform similar functionsand/or achieve like results. All such equivalent embodiments andexamples are within the spirit and scope of the present disclosure, arecontemplated thereby, and are intended to be covered by the followingclaims.

What is claimed is:
 1. A non-transitory computer-readable medium storingcomputer-executable instructions, and in response to execution by one ormore processors, the computer-executable instructions cause the one ormore processors to perform the steps of: establishing a control channelof a tunnel utilizing a first encryption technique, wherein the tunnelis between a local node including the one or more processors and aremote node, and wherein the control channel includes a sessionidentifier; establishing a data channel of the tunnel utilizing a secondencryption technique, wherein the data tunnel is bound to the controlchannel based on the session identifier; performing, over the controlchannel, device authentication and user authentication of one or moreusers associated with the remote node, wherein each of the one or moreusers includes a user identifier; and subsequent to the deviceauthentication and the user authentication, exchanging data packets overthe data channel with each data packet including a corresponding useridentifier.
 2. The non-transitory computer-readable medium of claim 1,wherein the first encryption technique is one of Transport LayerSecurity (TLS) and Secure Sockets Layer (SSL), and the second encryptiontechnique is one of TLS and Datagram Transport Layer Security (DTLS). 3.The non-transitory computer-readable medium of claim 2, wherein thefirst encryption technique is always a same one of TLS and SSL, and thesecond encryption technique is selected as the one of TLS and DTLS basedon support of the remote node.
 4. The non-transitory computer-readablemedium of claim 2, wherein the second encryption technique is selectedas the one of TLS and DTLS based on whether the remote node blocks UserDatagram Protocol (UDP) port 443 traffic.
 5. The non-transitorycomputer-readable medium of claim 1, wherein the first encryptiontechnique and the second encryption technique are different.
 6. Thenon-transitory computer-readable medium of claim 1, wherein the datapackets include data packets between the remote node and the local nodefrom various ports and having different protocols.
 7. The non-transitorycomputer-readable medium of claim 1, wherein the local node is part of acloud-based security system and the one or more users are connectedthereto via the tunnel for firewall and Intrusion Prevention System(IPS) functions.
 8. The non-transitory computer-readable medium of claim1, wherein one or more of the data packets further include anapplication identifier mapped from a local user device connected to theremote node.
 9. A node comprising: a network interface, a data store,and a processor communicatively coupled to one another; and memorystoring computer-executable instructions, and in response to executionby the processor, the computer-executable instructions cause theprocessor to establish a control channel of a tunnel utilizing a firstencryption technique, wherein the tunnel is between the node and aremote node, and wherein the control channel includes a sessionidentifier; establish a data channel of the tunnel utilizing a secondencryption technique, wherein the data tunnel is bound to the controlchannel based on the session identifier; perform, over the controlchannel, device authentication and user authentication of one or moreusers associated with the remote node, wherein each of the one or moreusers includes a user identifier; and subsequent to the deviceauthentication and the user authentication, exchange data packets overthe data channel with each data packet including a corresponding useridentifier.
 10. The node of claim 9, wherein the first encryptiontechnique is one of Transport Layer Security (TLS) and Secure SocketsLayer (SSL), and the second encryption technique is one of TLS andDatagram Transport Layer Security (DTLS).
 11. The node of claim 10,wherein the first encryption technique is always a same one of TLS andSSL, and the second encryption technique is selected as the one of TLSand DTLS based on support of the remote node.
 12. The node of claim 10,wherein the second encryption technique is selected as the one of TLSand DTLS based on whether the remote node blocks User Datagram Protocol(UDP) port 443 traffic.
 13. The node of claim 9, wherein the firstencryption technique and the second encryption technique are different.14. The node of claim 9, wherein the data packets include data packetsbetween the remote node and the local node from various ports and havingdifferent protocols.
 15. The node of claim 9, wherein the node is partof a cloud-based security system and the one or more users are connectedthereto via the tunnel for firewall and Intrusion Prevention System(IPS) functions.
 16. The node of claim 9, wherein one or more of thedata packets further include an application identifier mapped from alocal user device connected to the remote node.
 17. A method comprising:establishing a control channel of a tunnel utilizing a first encryptiontechnique, wherein the tunnel is between a local node including one ormore processors and a remote node, and wherein the control channelincludes a session identifier; establishing a data channel of the tunnelutilizing a second encryption technique, wherein the data tunnel isbound to the control channel based on the session identifier;performing, over the control channel, device authentication and userauthentication of one or more users associated with the remote node,wherein each of the one or more users includes a user identifier; andsubsequent to the device authentication and the user authentication,exchanging data packets over the data channel with each data packetincluding a corresponding user identifier.
 18. The method of claim 17,wherein the first encryption technique is one of Transport LayerSecurity (TLS) and Secure Sockets Layer (SSL), and the second encryptiontechnique is one of TLS and Datagram Transport Layer Security (DTLS).19. The method of claim 17, wherein the data packets include datapackets between the remote node and the local node from various portsand having different protocols.
 20. The method of claim 17, wherein thelocal node is part of a cloud-based security system and the one or moreusers are connected thereto via the tunnel for firewall and IntrusionPrevention System (IPS) functions.